mutt: update to 2.2.15

mutt/PKGBUILD

@@ -1,14 +1,17 @@
 # Maintainer: Felix Huettner <huettner94@gmx.de>
 
 pkgname=mutt
-pkgver=2.2.14
+pkgver=2.2.15
 pkgrel=1
 pkgdesc='Small but very powerful text-based mail client (net-utils)'
 url='http://www.mutt.org/'
 msys2_references=(
+  'archlinux: mutt'
   'cpe: cpe:/a:mutt:mutt'
+  'cygwin: mutt'
+  'gentoo: mail-client/mutt'
 )
-license=('GPL')
+license=('spdx:GPL-2.0-or-later')
 groups=('net-utils')
 backup=('etc/Muttrc')
 arch=('i686' 'x86_64')
@@ -27,7 +30,7 @@ makedepends=('docbook-xml'
              'gcc'
              'zlib-devel')
 source=("http://ftp.mutt.org/pub/mutt/${pkgname}-${pkgver}.tar.gz"{,.asc})
-sha256sums=('d162fb6d491e3af43d6f62f949b7e687bb0c7c2584da52c99a99354a25de14ef'
+sha256sums=('a51686104e4203f4c2a3b176527be3b95d08e808e94fd2dcadb7c30566bf894d'
             'SKIP')
 validpgpkeys=('8975A9B33AA37910385C5308ADEF768480316BDA') # Kevin J. McCarthy <kevin@8t8.us>